CN-122004735-A - Ophthalmic device and control method for ophthalmic device

Abstract

The invention provides an ophthalmic device capable of improving the easiness of performing visual effect of simultaneously comparing two straight line groups extending in mutually orthogonal directions. The ophthalmic device (1) has a display unit (22) capable of displaying an astigmatism examination chart (45) for acquiring an astigmatism axis angle, and a control unit for controlling the display unit (22) so as to rotationally display the astigmatism examination chart (45) in the display unit (22), wherein the astigmatism examination chart (45) has a first optotype (46) composed of a plurality of first straight lines (46 a) arranged in parallel at a predetermined interval and a second optotype (47) composed of a plurality of second straight lines (47 a) arranged in parallel at a predetermined interval and extending in a direction orthogonal to the first straight lines (46 a). Also, a first optotype (46) is displayed in a first area (48) of a circle. The second optotype (47) is displayed in an annular second region (49) surrounding the first region (48).

Inventors

• NITTA TOMOHIRO

Assignees

• 株式会社拓普康

Dates

Publication Date

20260512

Application Date

20251105

Priority Date

20241111

Claims (12)

1. 1. An ophthalmic device comprising a housing, a first lens, a second lens, and a third lens, characterized by comprising: a display section capable of displaying an astigmatism examination chart for acquiring an astigmatism axis angle of a subject, and a control section controlling the display section so as to rotationally display the astigmatism examination chart within the display section; the astigmatism inspection chart has a first optotype constituted by a plurality of first straight lines arranged in parallel at a predetermined interval, and a second optotype constituted by a plurality of second straight lines arranged in parallel at a predetermined interval and extending in a direction orthogonal to the first straight lines, The first optotype is displayed in a circular first area, and the second optotype is displayed in a circular second area surrounding the first area.
2. 2. The ophthalmic device of claim 1 wherein the ophthalmic device, Has a controller for a subject, the subject controller receives an operation of the subject, The control unit changes at least one of the width of the plurality of first lines, the interval between the first lines, the width of the plurality of second lines, and the interval between the second lines based on the operation of the subject received by the subject controller.
3. 3. Ophthalmic device according to claim 1 or 2, characterized in that, At least a part of the first straight line and the second straight line of the astigmatism inspection chart is not clear in outline.
4. 4. The ophthalmic device of claim 3 wherein the ophthalmic device, The brightness of at least a part of the first straight line and the second straight line of the astigmatism inspection chart in the width direction is changed according to a sine function.
5. 5. Ophthalmic device according to claim 1 or 2, characterized in that, Comprising a measuring optical system including an optical element capable of changing power and axial direction, the optical element being disposed between an eye to be inspected and the astigmatism examination chart, The control section controls the display section so as to display the astigmatism inspection chart in rotation within the display section, and stops rotation of the astigmatism inspection chart in a state where the subject clearly visually confirms the first optotype, The control unit controls the measurement optical system so that an axial direction of the optical element coincides with a predetermined angle set based on an inclination direction of the first visual target in a state where rotation is stopped, and changes a degree of the optical element to a state where the subject clearly visually confirms the second visual target.
6. 6. The ophthalmic device of claim 5 wherein the ophthalmic device, The control unit displays a radial pattern having a plurality of radial lines extending in a radial direction on the display unit, Rotation of the astigmatism examination map is started from a position of the first straight line along a radial line that is clearly visually confirmed by the subject.
7. 7. The ophthalmic device of claim 6 wherein the ophthalmic device, The control unit displays the radial graph by the display unit, and displays a mark display near the tip of any one of the plurality of radial lines, The marker display is moved in sequence, and the marker display is fixed near the tip of the radial line that is clearly visually confirmed by the subject.
8. 8. The ophthalmic device of claim 5 wherein the ophthalmic device, The control unit performs a first stage of rotating the astigmatism examination chart by 360 ° before a second stage of adjusting a rotation angle of the astigmatism examination chart according to a visual effect of the subject on the astigmatism examination chart when the display unit rotationally displays the astigmatism examination chart.
9. 9. The ophthalmic device of claim 1 wherein the ophthalmic device, Has a subject controller having a regulating disk member rotationally operated by the subject, The control section controls the display section based on a rotation angle of the dial member.
10. 10. A control method of an ophthalmic device having a display section capable of displaying an astigmatism examination chart for obtaining an astigmatism axis angle of a subject, and a control section controlling the display section so as to rotationally display the astigmatism examination chart within the display section, the control method of the ophthalmic device being characterized in that, An astigmatism examination chart display step of displaying the astigmatism examination chart on the display unit, the astigmatism examination chart having a first visual target composed of a plurality of first straight lines arranged in parallel at a predetermined interval, and a second visual target composed of a plurality of second straight lines arranged in parallel at a predetermined interval and extending in a direction orthogonal to the first straight lines; in the astigmatism examination chart display step, the first visual target is displayed in a first circular region, and the second visual target is displayed in a second circular region surrounding the first region.
11. 11. The method for controlling an ophthalmic device according to claim 10, wherein, The ophthalmic device has a subject controller that receives an operation of the subject, The control method includes a line interval changing step of changing at least one of a width of the plurality of first lines, an interval between the first lines, a width of the plurality of second lines, and an interval between the second lines based on an operation of the subject received by the subject controller.
12. 12. The method for controlling an ophthalmic device according to claim 10 or 11, wherein, The ophthalmic device has a measuring optical system including an optical element capable of changing power and axial direction, which is disposed between an eye to be inspected and the astigmatism examination chart, The control method comprises the following steps: a rotation display step of displaying the astigmatism inspection chart in rotation in the display section, A stopping step of stopping rotation of the astigmatism inspection chart in a state where the subject clearly visually confirms the first optotype, An axial direction adjustment step of adjusting an axial direction of the optical element to a predetermined angle set based on an inclination direction of the first target in a state where rotation is stopped, and And a power adjustment step of changing the power of the optical element to a state in which the subject clearly visually confirms the second visual target in a state in which the axial direction of the optical element is aligned with the predetermined angle.

Description

Ophthalmic device and control method for ophthalmic device Technical Field The present disclosure relates to an ophthalmic device and a control method of the ophthalmic device. Background In order to subjectively determine the axial angle of the astigmatism axis of a subject, an ophthalmic apparatus capable of rotatably displaying an astigmatism examination chart composed of two straight line groups each having 90 ° is known (for example, refer to patent documents 1 and 2). The axis angle of the astigmatic axis is obtained by the subject comparing the visual effects of both rectilinear groups simultaneously and based on the visual effects. Prior art literature Patent literature Patent document 1 Japanese Kokai publication Sho-52-42595 Patent document 2 Japanese Kokai publication Sho-59-71601 Disclosure of Invention Problems to be solved by the invention The ophthalmic device described in patent document 1 has an astigmatism inspection chart in which two types of straight line groups are arranged separately and the ends of the straight line groups are separated by contour lines. Therefore, the subject needs to move the line of sight to observe the two straight line groups, and there is a disadvantage in that it is difficult to compare the visual effects of the straight line groups at the same time. On the other hand, in the ophthalmic device described in patent document 2, there is shown an astigmatism inspection chart in which opposite ends of two kinds of straight line groups are arranged so as to be located on adjacent or overlapping virtual straight lines. Therefore, the ophthalmic device described in patent document 2 can suppress the movement of the line of sight of the subject when comparing two straight line groups at the same time. However, since the two types of straight line groups are arranged to face each other with the virtual straight line interposed therebetween, there is room for improvement in ease of performing the visual effect of the two types of straight line groups at the same time. The present disclosure has been made in view of the above-described problems, and an object thereof is to provide an ophthalmic apparatus and a control method of the ophthalmic apparatus capable of improving ease of proceeding of simultaneously comparing visual effects of two straight line groups extending in mutually orthogonal directions. Means for solving the problems In order to achieve the above object, an ophthalmic apparatus of the present disclosure includes a display unit configured to display an astigmatism examination chart for acquiring an astigmatism axis angle of a subject, and a control unit configured to control the display unit so as to rotationally display the astigmatism examination chart in the display unit, wherein the astigmatism examination chart includes a first visual target including a plurality of first straight lines arranged in parallel at predetermined intervals and a second visual target including a plurality of second straight lines arranged in parallel at predetermined intervals and extending in a direction orthogonal to the first straight lines, and the first visual target is displayed in a circular first region and the second visual target is displayed in a circular second region surrounding the first region. In order to achieve the above object, a control method of an ophthalmic apparatus according to the present disclosure includes a display unit configured to display an astigmatism examination chart for acquiring an astigmatism axis angle of a subject, and a control unit configured to control the display unit so as to display the astigmatism examination chart in rotation in the display unit, and includes an astigmatism examination chart display step of causing the display unit to display the astigmatism examination chart, the astigmatism examination chart including a first visual target and a second visual target, the first visual target being configured of a plurality of first straight lines arranged in parallel at predetermined intervals, the second visual target being configured of a plurality of second straight lines arranged in parallel at predetermined intervals and extending in a direction orthogonal to the first straight lines, the first visual target being displayed in a circular first area, and the second visual target being displayed in a circular second area surrounding the first area in the astigmatism examination chart display step. ADVANTAGEOUS EFFECTS OF INVENTION According to the ophthalmic device and the control method of the ophthalmic device of the present disclosure configured as described above, it is possible to improve the ease of performing the visual effect of simultaneously comparing two kinds of straight line groups extending in mutually orthogonal directions. Drawings Fig. 1 is an explanatory view showing an ophthalmic device of a first embodiment. Fig. 2 is an explanatory diagram showing a control system in the ophthalmic apparatus of the f